Sliding cover for a lens



FIG. 1 is a perspective view of a sliding cover for a lens, showing our new design;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a reduced perspective view thereof, showing the sliding cover in an open position to show the lens.

The broken lines showing throughout the drawing views are for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a sliding cover for a lens, as shown and described. 